Howtoforge posted a tutorial about setting up a headless VirtualBox installation with phpvirtualbox on Fedora 17

phpvirtualbox is a web-based VirtualBox front-end written in PHP that allows you to access and control remote VirtualBox instances. It tries to resemble the VirtualBox GUI as much as possible to make work with it as easy as possible. It is a nice replacement for the VirtualBox GUI if you run VirtualBox on headless servers. This tutorial explains how to install phpvirtualbox on a Fedora 17 server to manage a locally installed, headless VirtualBox.